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LicenseThis image is released under a CC BY-NC-SA 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseTelephone crossbar switch, Swedish Ericsson, 1921.
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Telephone crossbar switch, Swedish Ericsson, 1921.
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Telephone crossbar switch, Swedish Ericsson, 1921.
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Telephone crossbar switch, Swedish Ericsson, 1921.
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Telephone crossbar switch, made by Swedish Ericsson, Stockholm, Sweden, 1921.
Crossbar switching dates back to the earliest days of manual telephone switchboards, which used sets of overlapping brass bars with holes at the intersections for brass plugs to connect telephone calls. This switch had ten horizontal and ten vertical bars, so could support up to 100 subscribers. Crossbar switches needed less maintenance than step-by-step switches exchanges, and operated more simply.
Details
- Category:
- Telecommunications
- Object Number:
- 1970-454
- Materials:
- metal (unknown)
- Measurements:
-
overall: 195 mm x 430 mm x 185 mm, 9.5kg
- type:
- electric switch
- credit:
- Donated by L. M. Ericsson
